There used to be setup instructions for this. I thought they were in the Documents folder in the TwonkyServer folder but they are no longer there on the version I am running. I could probably dig them up, but I don't think this is worth your time. We stopped supporting this feature for the following reasons:

1. The Wii cannot stream video reliably 2. The Wii can access music files, but navigation is slow, and the files sometimes stop to rebuffer3. There are photo-rescaling issues